Answer:
Reference sources such as dictionaries, encyclopedias, almanacs, atlases, etc. are research tools that can help you with your paper or project. ... Reference sources are designed to be consulted rather than read through. Reference materials can be arranged alphabetically, topically, or chronologically
Explanation:
He want to work hard and smart
I don’t know for sure but I think it may be because more labor was needed for manufacturing.
Answer:
A. they are mammals
Explanation:
not all vertebrates are mammals. Fish, reptiles, birds, and more are vertebrates.